Tooth brush



Aug. 24, 1937. D N BOQTH 2,090,663

TooTH BRUsH Filed Dec. 15, 1934 INVENTOR.

BY 4% WM ATTORNEY;

Patented Aug. 24, 1937 UNITED STATES PATENT oFFlcF.

, TOOTH BRUSH David N. Booth, New York, N. Y.

Application December 15, 1934, Serial No. 757,637

4 Claims. (Cl. 15-167) My invention relates to an improvement in toothbrushes. The primary object thereof is to provide a brush of thischaracter which embodies a cleaning surface that conforms to the shapeof the teeth. A further object is to construct the brushing surface insuch a manner that it effectively cleans all three exposed surfaces ofthe teeth simultaneously, to wit, the labial, lingual or palatal, andcutting or masticating surfaces.

10 A still further object is to provide a brush head for the tooth brushof arcuate shape which, in cross section, is rounded or curved.

Another object of the nvention is to prevent the brushing surfaces ofthe bristles of the brush 15 from coming into contact with the gums ofthe user. In order to accomplish this object, the end, or lowerbristles, of the brush are constructed in such a manner that their sidesurfaces rest upon the top of the gum tissue to guide the brush along.30 the teeth of the user.

A further object of the invention is to provide a tooth brush having anarcuately shaped brush head in which the respective tip ends of the headhave a rounded configuration.

. ,5 Still another object is to provide a brush construction of thischaracter which through means of the curved brushing surface will permitthe proper cleaning of the interproximal spaces between the teeth andalso readily facilitate a thorough cleaning of lingual or palatal,labial and masticating portions of the teeth at the same time.

My invention further includes other objects, advantages and novelfeatures of construction and arrangement hereinafter more particularlyreferred to in connection with the accompanying drawing, in which Big. 1is a side elevation of a tooth brush made in accordance with the presentinventive conception.

Fig. 2 is a plan view of the tooth brush as illustrated in Fig. 1.

Fig. 3 is a front elevation of the brush showing the position of thebristles in the brush head.

Fig. 4 is a cross section of the brush head taken 45 along line 4-4,Fig. 3.

Fig. 5 is a cross section of the head along line 5-5, Fig. 3.

Fig. 6 is a front elevation showing a modification of the form of brushhead, and 50 Fig. 7 is a cross section of the brush head taken on line1-1, Fig. 6.

Referring particularly to Flgs. 1 to 5, inclusive, the tooth brush asherein constructed comprises a brush head II and handle II. Thebrushhead is 55 arcuate in form as indicated at I! in Fig. 3, the

same being approximately semi-circular. The handle of the brush isintegral with the brush head, the handle extending perpendicularly fromthe head at the central side portion thei'eof' as indicatcd at |3. Therespective lower tip surfaces of the bristle retaining head IO arecurved as designated in the drawing at l4. A cross section of the archedhead, Figs. 4 and 5 indicates that the extrados of the same is curved asshown at |5 to have an exterior rounded convex form, which extendslaterally throughout the length of the arch. At the bristle retainingside or intrados of the head the laterally extending curved surface isconcave in form.

The bristles of the brush extend from the interior surface of the archedconcaved head IO to provide a brushing surface which conforms with theshape of the teeth. This brushing surface, as shown at IB in Fig. 3 iscurved in a Vertical direction to conform to the lingual or palatal, andlabial portions of the teeth. The bristlesin the upper part of the headprovide a brushing edge for cleaning the masticating portions of theteeth. Fig. 4 of the drawing indicates that the bristles disposed in thehead adjacent the side surfaces of the teeth are also curved in ahorizontal direction as shown at I 1, so that the same are effective incleaning the interproximal spaces between the teeth. The bristles of thebrush head, which are adapted to clean the side walls of the teeth ofthe user have adjacent concave brushing surfaces curved in a horizontaldirectlon on both sides of the brush head, which curvature substantiallycorresponds to that of the laterally concave intrados. The lowest pairof effective bristles are employed to' clean the base of the teeth justabove the gum tissue, these bristles being longer and closer together attheir adjoining brushing surfaces than the remaining bristles in thebrush head, the same being designated in the drawing at IB. The brushingsurface of the long bristles |8 is straight as indicated at IS toprovide a means for also cleaning the teeth in the front portion of themonth. Bristles |8, extending from opposite sides of the brush head.situated below the curved tip surface bristles l'l, are positioned sothat the tip surfaces of the same are spaced in substantially parallelrelation.

In order to prevent the longer set of bristles from rubbirg upon the gumtissue of the user, a reinforcing set of bristles is employed below thesame as indicated at 20. This set of bristles is not constructed with anend brushing surface inasmuch as the purpose of the same is to provide anon-irritating side surface which is rested upon the gum tissue of theuser to efiectively guide the brush during use so that the brushlngsurfaces 4 of the vlonger bristles II do not rub against the gum tissue.

:6 With reference to Figa 6 and 'I the modiflca- While I have shown anddescribed the preferred embodiment of my invention, I do not desire tolimit myself to the specific forms illustrated, but

may alter the construction and arrangement of parts as occasion requireswithout enlarging the scope of my invention or departing from the spiritthereof as contained in the appended claims.

I claim as my invention:

1. A tooth brush 'having an arch shaped head,`

a handle member extending perpendicularly from the crown of the head.the extrados of the arch -shaped head being constructed to include alaterally convex .curvature and the intrados being similarly formed toinclude a laterally concave curvature, both the convex and concavecurvatures extending substantially throughout the distance of the archedsurface. a plurality of bristles extending from the intrados of thehead, the

bristles of the head adapted to clean the side walls of the teeth of-the user having adjacent concave brushing surfaces curved in ahorizontal 5 direction, when the brush is held in position for use, onboth sidesof the-brush head, substantially corresponding to that of thelaterally concave intrados. w

2. A tooth brush having an arch shaped head,

40 a handle member extending perpendicularly from the crown of the head,the extradoa of the arch shaped head being constructed to include alaterally convex curvature and the intrados being similarly formed toinclude a laterally concave curvature. a plurality of bristles extendingfrom the intrados of the head. the bristles of the head adapted to cleanthe side walls of the teeth of the user having adiacent brushingsurfaces curved in both'a horizontal and vertical direction, when thebrush-is held in position for use,

. and other bristles extending from opposite interior sides of the head,situated below the bristles adaptedtocleanthesidewallsoftheteethhavingbrushing surfaces curved in a horiaontal direction when the brush' isheld in a position for use.

4. Atoothbrushhavinganarchshapedhead, a handle member extendingperpendicularly from the crown of the head, a piurallty of bristlesprojecting substantially radially from the interior face of the headadapted to contact slmultaneouslly both the inner and outer sides of theteeth of the user, the bristles extending from both sides of the brushhead for cleaning the inner and outer side walls of the teeth havingadiacent brushing surfaces curved in both a horizontal an'd Verticaldireetion when the brush is held in position for use, the adjacentbrushing surfaces which are horiaontally curved being concave in form.

DAVID N. BOOTH.

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